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Pop Dynamics Exam 3
Pop Exam 3
52
Environmental Studies
Undergraduate 4
12/14/2015

Additional Environmental Studies Flashcards

 


 

Cards

Term
1. Define and distinguish between the annual crop and inversity principles. What effect does harvest have on equilibrium density for each of the theories?
Definition

Annual Crop = Numbers produced in excess of winter threshold are surplus. May be harvested without affecting the longterm density. Harvest mortality simply replaces natural mortality, and does not affect equilibrium (winter) density. Pertains only to seasonal harvest.

Inversity = • Inputs & outputs balance at certain population density (i.e., K) • Harvest will reduce density. Pertains to harvest all year.

Term
2. Describe and distinguish between compensatory and additive mortality. What role do thresholds play in distinguishing between compensatory and additive mortality?
Definition

Compensatory occurs when survival, reproduction or movement into the population increases because of the harvest of animals, thereby reducing the effects of harvest mortality on population growth.

Additive – occurs when harvest mortality adds to that of natural mortality

 

Hunting may be compensatory up to a certain threshold. Once exceeded, more hunting becomes additive. Challenge is to determine that threshold before setting harvest goals.

Term
3. What species characteristics tend to be correlated with a greater ability to compensate for harvest mortality? What characteristics are correlated with low capacity to compensate?
Definition

 • Compensation greatest for species with higher background mortality – Short lifetimes & high reproduction • Compensation least for species with longer lifetimes & low reproduction

Term
4. Describe how harvest mortality (coyote control) is compensated for in populations of western coyotes.
Definition

– Larger litter sizes – Increased reproduction in yearlings – Increased juvenile survival – Increased immigration

Term
5. Describe the spatial harvest control method. Why is this method relatively ineffective in areas of fragmented habitat?
Definition

• Some areas closed to harvest to ensure abundant harvests in other areas: “refuges” • Adjusted movement rates among populations with and without harvest

Term
6. How is net reproductive value a useful concept in understanding the difference between the effects of harvest mortality and natural mortality on animal populations?
Definition

Less effect when harvesting animals are of low reproductive value – Hunters take cow elk with high reproductive value vs – Wolves take older cow elk & calves, both of lower reproductive value

Term
7. Explain how harvest mortality can result in genetic and resulting physical changes in animal populations.
Definition

Bighorn sheep trophy hunting in Alberta – For 30 years, any ram with a min legal horn size could be taken – Thus, hunters took rams that quickly grew big horns & body size, selecting  48 years old – Thus, removing them from population before they could breed • Implemented “fullcurl” restriction – must extend beyond ram’s nose    

Term
8. In the “Tale of Two Does” side bar of John McDonald’s article on “Deer Management in Massachusetts” how do environmental conditions affect each of the two does in the story and what are the implications of these effects for the demographic characteristics of deer populations in those two areas of the state?
Definition

Dover does are lower elevation than Savoy does so warmer climate, less snow, more abundant food, better food (gardening). Healthier does after winter are more likely to have twins or triplets so more deer in Dover than Savoy more people getting pissed.

Term
9. What are the deer management goals for MA?
Definition

Healthy, Balanced Deer Population }

 Below Level where Major Impacts to Habitat/other Species are Seen }

Balance Social Desires and Tolerance Hunting/Viewing Opportunities Public Safety and Public Health Ag/Residential Property Damage

Term
12. What data are collected at a deer check station and how do deer managers use these data?
Definition

• Sex

• Age (fawns, yearlings, adult/age classes)

• Dressed body weight

• Antler beam diameter

• Others ‐ # corpora lutea scars, liver condition, adrenal weight, tick abundance,

 

• Est. total harvest • Est. total effort expended • Sex ratio of harvest • Sexspecific age structure of harvest

Term
13. Why does The Nature Conservancy consider too many deer to be perhaps a bigger threat to Eastern forests than climate change?
Definition

More immediate, happens faster, eat everything, drive out other species. Risks to people collision, lyme.

Term
14. Identify the most serious challenges to maintaining deer density goals in Massachusetts.
Definition

Many interested parties with different goals. Success of hunter dependent.

Term
14. Identify the most serious challenges to maintaining deer density goals in Massachusetts.
Definition

Many interested parties with different goals. Success of hunter dependent. No other predators

Term
15. Be prepared to discuss the pros and cons of the 8 options for controlling deer populations as presented in the publication “An Evaluation of Deer Management Options” by Ellingwood and Caturano.
Definition

1. Hunting,

2. No management, starvation, (no predators)

3. Trap and Transfer, (expensive, where?),

4. Fences/Repellents (effort high, repellent only in no rain, expensive),

5. Birth Control (cost, non targets, logistics),

6. Feed them (pop still grows),

7. Sharpshooters (cost, no $ from hunters),

8. Predators (variable, too many people).

Term
17. Describe the special problems associated with furbearer management.
Definition

Traps controversial , varying effectiveness (by-catch), and demand not constant (tied to market for pelts).

Term
18. Describe the four types of traps used for trapping furbearers.
Definition

Foot holds (non-lethal, cruel?, most common),

Conibear (lethal, second common) ,

snares (lethal, 3rd common),

others (cage based, time senisitive but non lethal, least common).

Term
19. Describe the characteristics that are used to evaluate traps?
Definition

Effectiveness – trap’s ability to adequately hold or kill a captured animal – usually measured as number of captures/100 trap nights – unpadded (73%) vs. padded (50%) foothold traps for coyotes – greatly affected by trapper experience.

 

Selectivity – extent that traps capture “wanted” vs. ‘Unwanted” species Factors affecting unwanted capture rates • trap type & trap site • type of set & bait used • time of year & trapper technique Highly variable ranging from no unwanted animals to 2 unwanted animals per wanted furbearer caught

Term
20. How can injury from traps be reduced?
Definition

Efforts to reduce injuries – use of smaller traps – daily, early morning checks of traps – tranquilizer tabs – padded traps.

Term
21. What is pelt sealing and why is it useful?
Definition

Mandatory tagging of pelts by state – Provides more accurate harvest information – Reduces bias in reporting process – Very costly logistically, so few states do it

Term
22. Does this graph of furbearer harvest tell you about the status of the two furbearer populations?
Definition

Not Much! • Trapper effort • Pelt prices • Number of trappers

Term
23. Why is it so important to have data on trapping effort to go along with data on the number of animals harvested each year?
Definition

Because effort is variable due to market changes. So If effort high but catch low means different than effort low catch low.

Term
24. Other than population abundance what demographic characteristics of black bears are monitored in Massachusetts? What demographic characteristic of black bear populations has the most impact on population growth?
Definition

žAdult survival rates • Adult female survival rates have most impact on population

žAge at first reproduction

žAverage litter size • 1st litters vs subsequent

žCub survival • 1st litters vs subsequent litters

Term
25. Other than population abundance what other aspects are considered when deciding how to manage bear populations in MA?
Definition

• Hunter/trapper satisfaction and ability • Habitat suitability or management • Public complaints • Vehicle collisions • Public perception of the population • Public perception of management options

Term
26. Describe the recovery of beaver populations in MA from 1928 to the present (as described in the article by Langlois and lecture in class).
Definition

Elminiated form MA by hunting/habitat loss, then reappeared in 1928, people pumped about it. Then no predators (wolves) or diseases, or competition so they exploded. People pissed, hunting/exclosure sound good again.

Term
27. What was Question 1, and what effect did it have on trapping furbearers in Massachusetts?
Definition

ž Question 1 – “Wildlife Protection Act • Banned use of footholds and body-gripping traps • Dramatic drop in beaver harvest – dramatic increase in population.

 

Limited most effective way of pop control and study conducting.

Term
28. How do the U.S. Fish & Wildlife Service and Canadian Wildlife Service estimate waterfowl abundance?
Definition

 

Waterfowl Breeding Population & Habitat Surveys : • Conducted in May and June • Aerial surveys along transects with a sample of ground/helicopters counts to estimate visibility bias • Count number of ducks and ponds

Production & Habitat Surveys: • Conducted in July • Aerial & ground surveys (not concurrent) • Only a portion of strata surveyed • Number of duck broods (brood index) & number of ponds

Term
30. How does the USFWS determine how many waterfowl were harvested?
Definition

Annual Waterfowl Harvest Surveys – (2 parts)

 Part I.  HIP Harvest Information Program FWS selects a random sample of migratory bird hunters & asks them for information – Kind and number of migratory birds hunted – Used to estimate total harvest.

Part II: Cooperative Parts Collection Survey Sample of successful hunters asked to mail in 1 wing from each duck & tail from each goose harvested

Term
31. Explain how the Migratory Bird Treaty Act structures how the U.S. government regulates waterfowl harvests?
Definition

• MBTA made it unlawful to hunt, kill, or possess migratory birds except as permitted by regulations set by the Secretary of the Interior.

• MBTA authorizes the Secretary to determine when, if at all, to allow the hunting of  birds.  SEASON IS CLOSED UNTIL OPENED

• MBTA does not prohibit States from making or enforcing regulations, provided such regulations are not more liberal than those approved by the Secretary

Term
32. Identify and briefly discuss the two categories of annual regulations for waterfowl management.
Definition

Framework Regulations:

 • Framework Dates - Set for each flyway & states select dates within framework when waterfowl most abundant

 Season Length – May not exceed 107 days for migratory birds

• Daily Bag Limit – varies by flyway & highly variable in response to population estimates

• Shooting Hours – ½ hr before sunrise to sunset

• Season length & bag limits – cornerstones for managing harvest of migratory birds

 

Special Regulations :

• Zoning & Split Seasons • Closed seasons for low abundance species (e.g. harlequin duck) • Special Seasons – focus on underharvested species or opportunities for special user groups • Quotas also used for limited resources (e.g. some Canada goose & sandhill cranes populations)

Term
33. What is the mallard fall flight index and what goes into estimating it?
Definition

• Estimated size of midcontinent mallard population (traditional survey area + MI, MN, &WI) for the fall migration

• Calculated based on: – Breeding population size – Habitat conditions – Adult summer survival – Projected fall age ratio (young/adult)

Term
34. Briefly discuss what types of activities/parameters are managed/controlled by the framework regulations.
Definition

When (time, dates) and amount (bag limit).

Term
35. Describe Adaptive Harvest Management and why it was developed.
Definition

Goal: “Adaptive harvest management describes the ability to make a sequence of decisions, in the face of uncertainty, that is optimal with respect to a stated objective, recognizing some constraints" (D. R. Anderson) • Managing in the face of uncertainty with a focus on its reduction.

Term
36. Identify the four steps in the Adaptive Management Feedback Loop?
Definition

• Monitor – Estimate resource status

• Learn (reduction in structural uncertainty) – Compare predictions to estimates – Update model weights

• Predict (Structural Models) – Modelspecific predictions of effects of management given resource status

• Manage – Implement management alternative maximizing objective(s) based on resource status and model weights

Term
37. What are the “key components” of Adaptive Harvest Management?
Definition

• Limited number of regulatory alternatives (flyway specific season lengths, bag limits, framework dates)

• Set of population models describing various hypotheses about effects of harvest & the environment on waterfowl abundance

• Measure of reliability for each population model (weights)

• Mathematical description of the harvest management objectives by which harvest strategies can be evaluated

Term
38. Discuss the sources of uncertainty that affect Adaptive Harvest Management for waterfowl.
Definition

 Environmental Stochasticity e.g., weather, habitat

• Partial Observability Uncertainty about population status

• Partial Controllability Decisions only partially control actual magnitude of actions

• Structural Uncertainty Relationship between management action and population status/response

Term
39. What key variables are used by the USFWS to determine the optimum harvest strategy for midcontinent mallards?
Definition

Harvest strategy derived using combinations of: – Breeding population size – Environmental conditions – Model weights Assesses which model best describes the dynamics of the managed populations.

Term
40. Briefly identify the four AHM models that are tested for waterfowl abundance and harvest.
Definition

• 4 models of population dynamics – Mortality: Additive vs. compensatory – Reproduction: Strong vs. weak density dependence

Term
42. What is ‘probability of detection’ and how is it used in distance sampling methodologies?
Definition

Probability of detecting an animal, given that it is at a distance x from the line. Assumes animals closest to line are more likely to be detected.

Term
43. What are the assumptions for distance sampling methods?
Definition

• Lines are randomly located in the study area

• Animals on the line are certain to be detected [g(0) = 1]

 • Detected animals do not move in response to the observer before detection

• Distances are recorded without error

 • Detection curve has a ‘shoulder’

 • Detections are independent events

 • Animals are counted only once from a single line

Term
44. If census techniques yield better estimates of elephant abundance why would wildlife agencies consider using strip (fixed-width) or distance sampling instead?
Definition

Easier, cheaper, quicker, etc.

Term
45. What is statistical ‘power’ and why is it an important concept for the conservation of wildlife populations?
Definition

The probability that a test correctly rejects the null hypothesis. 1- # of type II errors.  How good is your monitoring really at being right?

Term
46. What are the assumptions of the Leslie Method for Catch-per-unit-effort (CPUE) estimating of wildlife population abundance or density?
Definition

• Closed population

• Probability of capture is equal

• Probability of capture is linearly proportional to the effort extended for the sample

Term
47. Explain what statistical function is used to estimate population abundance using the removal (CPUE) method.
Definition

• The simultaneous analysis of 2 or more variables

 • Estimate the relationship of one variable with another in terms of a function

• To predict values of one variable in terms of the other

Term
48. What are some situations where the removal (CPUE) method would be a good option for estimating abundance?
Definition

Leslie – linear relation between CPUE and Nt • Used when a significant proportion of population is removed

 

DeLury – nonlinear relation between CPUE and Nt • Used when the proportion of the population taken by a unit of effort is small (i.e. 0.02)

Term
49. What is Strategic Habitat Conservation?
Definition

1. A structured way to critically thinking about what we do and why we do it; or

2. Setting explicit objectives for populations and then systematically figuring out how to achieve them most efficiently using our own resources and by working with partners.

Term
50. Explain why the USFWS and USGS adopted the Strategic Habitat Conservation approach to get away from “…grabbing the low hanging fruit.”
Definition

Could happen cause: • Advancements in conservation theory • Geospatial technologies • Increasing emphasis on accountability Increasing the effectiveness & efficiency of achieving conservation objectives


Did happen cause: • A shift in the overarching aim of conservation to system sustainability 

  • A shift in emphasis from the project scale to the landscape scale

• More scienceintensive approaches to planning – Modelbased – Spatially explicit – Predictive – Outcomebased  vs. activitybased goals and objectives

 • An everincreasing emphasis on biological accountability • An emerging emphasis on socially viable solutions (socio ecological sustainability)

Term
51. List and briefly describe the functional elements of Strategic Habitat Conservation
Definition

• Biological planning

• Conservation design

 • Conservation delivery

 • Decisionbased monitoring

• Assumptiondriven research

Term
52. Explain the difference between “activity-based” and “mission-oriented” conservation objectives and provide an example of each.
Definition

Example: activity-based objectives (Focused on actual numbers, precise) -  Protect and restore 20,000 acres of bottomland hardwoods in the Mississippi Alluvial Valley

 

Example: mission-oriented objectives (Overarching) - Reestablish and maintain three viable subpopulations of LA Black Bear in the Tensas Basin, Red River Backwater, and Atchafalaya Basin of Louisiana.

Term
53. What are the benefits of Strategic Habitat Conservation?
Definition

• Better communication among programs and externally

• Records of decisions

• More credibility

• Greater efficiency

 • Greater capacity for leadership in conservation community

 • Strategic research and monitoring

 • Accountability

Term
54. Define “biodiversity” and describe the three levels of biodiversity (not to be confused with the three types of diversity).
Definition

“Is the variety of life and its processes; and includes the variety of living organisms, the genetic differences among them, and the communities and ecosystems in which they occur.”

Term
55. Explain how human biology can get in the way of rational decision-making about species conservation.
Definition

We like things that are big and look like babies, but are less driven to help small, not cute things no matter how important they are ecologically.

Term
56. Give four examples of how biodiversity is linked to human welfare.
Definition

Penicillin, disease tolerant rice species, spider goats, horseshoe crab blood in endotoxin testing makes things safer.

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